A drug coated balloon (DCB) catheter (4) comprising a connector (8), a shaft (20) extending from a proximal end (24) to a distal end (28) along an axial direction (X-X) and having a guidewire lumen (32) and an inflation lumen (36), the shaft (20) being connected to the connector (8) on said proximal end (24) and provided with an inflatable balloon (48), fluidically connected with said inflation lumen (36) in order to be selectively inflated and/or deflated. Advantageously the balloon (48) is conical and axis-symmetrical around a prevalent extension axis (S-S), wherein the balloon (48) has an increasing diameter (60), moving from a first end (52) to a second end (56), said diameter (60) being measured on a section plane perpendicular to said prevalent extension axis (S-S), wherein an external surface (64) of the balloon (48) is coated with a drug for treating restenosis.
